Periodic table answers

2. Periodicity describes the repeating pattern of physical and chemical properties that can be seen when the elements are arranged according to their atomic number.3. None of the noble gases (He – Rn), which make up the eighth group, had been discovered when Mendeleev first produced his periodic table in 1869. More recently the number pf groups has been increased from 8 to 18 as the transition metals have their own...


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